Novel winter cement based grouting agent for railway concrete beam support

Abstract

The invention relates to a winter cement-based grouting material for railroad concrete beam supports, which is formed by mixing and stirring cement, sand, finely ground steel slag powder, a swelling agent, an accelerator, a retarder, a water reducing agent and an active agent. The parts by weight of the components are as follows: 100 parts of cement, 100-250 parts of sand, 5-25 parts of finely ground steel slag powder, 3-20 parts of swelling agent, 0.1-3 parts of accelerator, 0.2-2 parts of water reducing agent, 0.1-3 parts of retarder and 1-5 parts of active agent. Finely ground converter slag which is naturally stored for 3-6 months is adopted for the finely ground steel slag powder and the specific surface area is 400-600m<2> / kg; the total content of the calcium oxide and magnesium oxide in the finely ground steel slag powder is 5-15%. The cement-based grouting material can cause the grouting material to be used for construction at the temperature of 0-15 DEG C; the fluidity of the grouting material is still more than 240mm after being mixed for 35min and the 2h compression strength is larger than 20MPa; besides, the grouting material can endure the extreme temperature of-40 DEG C in the north of China, with strength not reduced and stable later strength; the volume of the grouting material slightly expands during hardening process, which can ensure the poured space is dense and full.

Description

technical field [0001] The invention relates to a winter cement-based grouting material for railway concrete beam supports, which is suitable for grouting concrete beam supports of railway bridges, light rail bridges, highway bridges and urban viaducts. Background technique [0002] With the strengthening of comprehensive national strength, my country's high-speed railway network construction plan will be gradually put into practice. It is expected that before 2020, my country will initially build a high-speed railway network with a speed of more than 200km / h; at the same time, the country will increase investment in infrastructure, highways Bridges and city viaducts will also be vigorously developed. In this large-scale construction, a large number of prefabricated box girders need to be hoisted, and after the box girders are hoisted in place, it is necessary to grout the connecting parts of the box girders and bridge supports to support and fix the box girders and ensure th...

AI Technical Summary

Problems solved by technology

Due to the lack of research on cement-based grouting materials for winter bearings in my country, the existing common grouting material products are not suitable for the construction problem of negative temperature in winter

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